The district has lots of hills and valleys if you are at the top of a hill you might have lower water pressure, if you are in a valley you could have higher pressure. These areas are referred to as pressure zones.
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A PRV is an adjustable mechanical device designed to keep water pressure between 25 and 75 pounds per square inch (psi).
The Universal Plumbing Code (UPC) recommends to use a PRV if your water pressure is 80 pounds per square inch (psi) or higher.
The Universal Plumbing Code (UPC) minimum is 20 pounds per square inch (psi).